python - Plotting two line plots of different index lengths with disconnects where there is no data -

i have 2 data sets need plot on single pair of axes. each data set contains 2 lists:

• dates (in format of yyyymm)
• values (monthly averages)

the problem having 1 data set contains summer months (plotted in red), while other contains every month (plotted in blue). result, image 1 below:

however, don't want line plot summer months (red) connect between years. is, don't want draw line between data points 200208 , 200306. want gap in red line data not exist, graph joe kuan.

the code used plot first image is:

#data1 x = monthly_avgs_aod.index.tolist() x = [dt.datetime.strptime(i, '%y%m') in x]  y = monthly_avgs_aod.values.tolist()  #data2 q = monthly_avgs_pm.index.tolist() q = [dt.datetime.strptime(i, '%y%m') in q]  w = monthly_avgs_pm.values.tolist() plt.plot(q, w, '-r')     plt.plot(x, y, ':b') 

the data using looks this:

#data1 x=['200101','200102','200103','200104','200105','200106','200107','200108','200109','200110','200111','200112','200201','200202','200203','200204','200205','200206','200207','200208','200209'] y=[30.2,37.6,34.7,27.1,31.9,43.9,42.4,42.3,34.4,40.0,47.2,40.8,34.7,27.1,31.9,43.9,42.4,42.3,34.4,40.0,47.2]  #data2    q=['200106','200107','200108','200206','200207','200208'] w=[19.7,18.6,15.2,17.3,16.9,18.2] 

any appreciated.

the easiest solution in case both lists of dates share same dates (i.e. month might either in list or not), fill list contains summer months none values @ positions there no data , plot against same x complete y list plotted against.

import matplotlib.pyplot plt import datetime dt #data1 x=['200101','200102','200103','200104','200105','200106','200107','200108',    '200109','200110','200111','200112','200201','200202','200203','200204',    '200205','200206','200207','200208','200209'] x = [dt.datetime.strptime(i, '%y%m') in x]  y=[30.2,37.6,34.7,27.1,31.9,43.9,42.4,42.3,34.4,40.0,47.2,    40.8,34.7,27.1,31.9,43.9,42.4,42.3,34.4,40.0,47.2]  #data2    q=['200106','200107','200108','200206','200207','200208'] q = [dt.datetime.strptime(i, '%y%m') in q]  w=[19.7,18.6,15.2,17.3,16.9,18.2]  i, xi in enumerate(x):     if xi not in q:         w.insert(i, none)   plt.plot(x,y, '-r')     plt.plot(x,w,':b')   plt.show()